Dropbox app on Windows 11 intermittently hangs.

Here's an update: it was hung again this morning. I rebooted and when Dropbox was starting, it displayed the message in the photo: "To sync this file, give DropBox permission to access it". 

My wife took a photo this morning with the DropBox app on her iPhone, which was logged into our shared Dropbox account. The photo was automatically downloaded by Dropbox into the DropBox folder on my computer, and then apparently, Dropbox couldn't access the photo it downloaded, either before or after I rebooted the machine.  The dialog box appeared after the reboot when the frozen Dropbox app restarted.

After clicking on the "issue', I told it to "fix the problem" using the button and it worked for 2-3 minutes before finally declaring victory.  

I don't understand how Dropbox could download a file and then not be able to access the file. I do use Windows Defender and I suppose it could have locked and scanned the photo after it appeared, making Dropbox time out. That doesn't explain why Dropbox spent so long "fixing" the entire Dropbox folder, though. I have not messed with permissions on my computer.

The dropbox folder is in my home directory and is not itself inside any other folder that's backed up to the cloud. The Dropbox folder is, however, backed up by Crashplan, a true cloud backup service that backs up my entire computer. But so is OneDrive, iCloud photos, etc. It is also locally backed up by Macrium Reflect to an external DAS drive. None of these should be problems, nor do they change file/folder permissions.

I'll keep watching the DropBox app -- maybe this will finally fix the problem with the Dropbox app intermittently hanging.